Continuous observations of the changes in specimens which were heated in gas atmospheres of 10−3 to 10−1 mm Hg in the electron microscope, had already been carried out by Ito and Hiziya (1), and by Hashimoto, Tanaka, and Yoda (2). In their experiments, they used oxygen, hydrogen, and air by which the furnace and the surfaces of the objective pole pieces in the specimen chamber were little corroded. The first stage of our study whether gases of stronger activity might be admitted to the electron microscope, was the examination of the very corrosive hydrogen sulphide in the gas-reaction device previously reported (1). Here we observed the crystal growth of copper sulphide which originated from a copper mesh as specimen.
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